Even though it's her longtime nickname, Madonna may not have the right to use the phrase "material girl" for the clothing line she started with daughter Lourdes. According to TMZ, a company called L.A. Triumph, Inc. recently filed suit against Madonna claiming that she misappropriated the Material Girl name for her clothing line.

Triumph claims in the lawsuit that it's been selling clothes under the Material Girl name since 1997, earning millions of dollars on the phrase. The suit claims that Madonna — who released the conspicuous-consumption song "Material Girl" in 1985 — has illegally infringed on their trademark for use in the pop star's Material Girl clothing line for juniors that was launched earlier this year.

"I always have two reactions when Lola comes into my room with an outfit on: One is, 'Oh my God, she looks amazing, what incredible style.' And then my second reaction is, 'She's dressed completely inappropriately for school,' " Madonna told People about her 13-year-old daughter's style, which was an inspiration for the line. "I usually tell her to take off her three-inch or six-inch platforms and pull her skirt down just a little bit and take off some of the black eye makeup. ... My role is really to make sure we were all going in the right direction ... and it was a line that I could stand behind and be proud of and feel good about and one that she could also feel represented her. ... I really like the way Lola dresses, and I think this line is absolutely an extension of her taste."

A spokesperson for Madonna had no comment on the lawsuit at press time.

The company wants a Los Angeles judge to issue a declaration that Madonna's use of the phrase creates "deception" in the marketplace. It is also asking the judge to order the singer and her company to turn over all the profits they've made so far on the line.